ATBECHDE....FRGB..ITLILUNLSE......................R0325228EUROPEAN PATENT APPLICATIONA319900321EP89100794.019890118enenen7979/8819880118JP19900321199012198907261989304 4C 09K 19/34 AdeSmektische FlüssigkristallmischungenA smectic liquid crystal mixturefrMélange liquide cristallin smectiqueChisso Corporation0020168048 683 a/schö6-32, Nakanoshima 3-chome Kita-kuOsaka-shi Osaka-fuJPTakeshita, Fusayuki17, Tatsumidai-Higashi 2-chomeIchihara-shi Chiba-kenJPTerashima, Kanetsugu8890, Goi Ichihara-shiChiba-kenJPIchihashi,Mitsuyoshi17, Tatsumidai-Higashi 2-chomeIchihara-shi Chiba-kenJPKikuchi, Makoto1708-7, JouzaiKisarazu-shi Chiba-kenJPFurukawa, Kenji16-7, Kurihama 1-chomeYokosuka-shi Kanagawa-kenJPHansen, Bernd, Dr.rer.nat.et al00004922Hoffmann, Eitle & Partner Patentanwälte Postfach 81 04 2081904 MünchenDEATBECHDEFRGBITLILUNLSE19900321199012

A smectic liquid crystal mixture comprising base substance(s) and exhibiting at least one of achiral SC phase and the like, and having at least one of SC phase and the like, which mixture is useful for ferroelectric liquid crystal materials having high-speed response and also has a low melting point and smectic C phase within a broad temperature range, and liquid crystal materials using the mixture are provided,
which mixture comprises at least one member of pyridine compounds of the formula wherein R¹ and R² each are 1-18C alkyl and X is H or halogen, and at least one member of pyrimidine compounds of the formula wherein R³ and R⁴ each are 1-18C alkyl or alkoxy and is